الفهرس 
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Abstract
This study was performed to evaluate and compare the histo-pathological responses of dog’s primary molars dental pulp to calcium sulphate pulpotomy versus formocresol. It was conducted on 60 primary molars of six dogs between the ages of six to eight weeks. The upper right and left most distal molars were used as control, while the rest of the molars were treated by calcium sulphate and formocresol pulpotomy. The dogs were divided into two groups; three dogs each. The first group was sacrificed after 4 weeks, while the second was sacrificed after 8 weeks. The pulp tissues of all teeth were submitted to histological evaluation. Calcium sulphate treated pulps revealed mild hyperemia and inflammation, continuity of odontoblastic layer and beginning of formation of predentin. On the other hand, those treated with formocresol showed moderate to severe hyperemia, loss of continuity of odontoblastic layer, and no pre-dentin was seen. Histological reaction of dental pulp to calcium sulphate was more favorable than the reaction to formocresol. The greater success rate of calcium sulphate compared to formocresol pulpotomy in this study could be attributed to the anti-inflammatory effect of calcium sulphate compared to formocresol and thus to the formation of pre-dentin.